include/cinder/gl/StereoAutoFocuser.h

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/*
 Copyright (c) 2012, The Cinder Project, All rights reserved.
 This code is intended for use with the Cinder C++ library: http://libcinder.org
 
 Portions of this code (C) Paul Houx
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are permitted provided that
 the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and
    the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
    the following disclaimer in the documentation and/or other materials provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
*/

#pragma once

#include "cinder/gl/gl.h"
#include "cinder/gl/Fbo.h"

// forward declarations
namespace cinder {
    class Camera; class CameraPersp; class CameraStereo;
} // namespace cinder

namespace cinder { namespace gl {

class StereoAutoFocuser {
  public:
    StereoAutoFocuser()
        : mSpeed(1.0f), mDepth(1.0f) {}

    void                    autoFocus( CameraStereo *cam, const Area &area = gl::getViewport() ) { autoFocus( cam, area, GL_NONE ); }
    void                    autoFocus( CameraStereo *cam, const gl::Fbo &buffer ) { autoFocus( cam, buffer.getBounds(), buffer.getId() ); }
    float                   getSpeed() const { return mSpeed; }
    void                    setSpeed( float factor ) { mSpeed = math<float>::clamp( factor, 0.01f, 1.0f); }
    float                   getDepth() const { return mDepth; }
    void                    setDepth( float factor ) { mDepth = math<float>::max( factor, 0.01f); }

    void                    draw();
  private:
    void                    createBuffers( const Area &area );

    void                    autoFocus( CameraStereo *cam, const Area &area, GLuint buffer );
  public:
    static const int        AF_WIDTH = 64;
    static const int        AF_HEIGHT = 64;
  private:
    float                   mSpeed;
    float                   mDepth;

    Area                    mArea;

    Fbo                     mFboSmall;
    Fbo                     mFboLarge;
    std::vector<GLfloat>    mBuffer; 

    Vec3f                   mNearest;
};

} } // namespace cinder::gl